【Android】詳解Android 網路操作

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目錄結構：

contents structure [+]

1. 判斷網路
1. 判斷是否有網路連接
2. 判斷WIFI網路是否可用
3. 判斷MOBILE網路是否可用
4. 擷取當前網路連接的類型資訊
2. 監聽網路

擷取網路資訊需要在AndroidManifest.xml檔案中加入相應的許可權。

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

1.判斷網路1.1 判斷是否有網路連接

public boolean isNetworkConnected(Context context) {if (context != null) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();if (mNetworkInfo != null) {return mNetworkInfo.isAvailable();}}return false;}

1.2判斷WIFI網路是否可用

public boolean isWifiConnected(Context context) {if (context != null) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mWiFiNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);if (mWiFiNetworkInfo != null) {return mWiFiNetworkInfo.isAvailable();}}return false;}

這裡需要注意，該方法只是判斷當前環境下是否有可用的WIFI，並不是判斷是否已經串連上WIFI。

1.3 判斷MOBILE網路是否可用

public boolean isMobileConnected(Context context) {if (context != null) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mMobileNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);if (mMobileNetworkInfo != null) {return mMobileNetworkInfo.isAvailable();}}return false;}

1.4 擷取當前網路連接的類型資訊

public static int getConnectedType(Context context) {if (context != null) {ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {return mNetworkInfo.getType();}}return -1;}

getType()的傳回值可以是ConnectivityManager中的TYPE_MOBILE、TYPE_WIFI、TYPE_WIMAX、TYPE_ETHERNET、TYPE_BLUETOOTH、其他類型。

2.監聽網路

 定義廣播接受者：

    BroadcastReceiver connectionReceiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            ConnectivityManager mConnectivityManager = (ConnectivityManager) context                    .getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo mNetworkInfo = mConnectivityManager                    .getActiveNetworkInfo();            int type = -1;            if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {                type = mNetworkInfo.getType();            }            if (type == ConnectivityManager.TYPE_WIFI) {                Toast.makeText(MainActivity.this, "wifi", Toast.LENGTH_SHORT)                        .show();            } else if (type == ConnectivityManager.TYPE_MOBILE) {                Toast.makeText(MainActivity.this, "網路可用", Toast.LENGTH_SHORT)                .show();            }else if(type==-1){                Toast.makeText(MainActivity.this, "網路不可用", Toast.LENGTH_SHORT)                .show();            }else{                Toast.makeText(MainActivity.this, "未知網路", Toast.LENGTH_SHORT)                .show();            }        }    };

在合適的位置註冊：

        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);        registerReceiver(connectionReceiver, intentFilter);

在合適的位置取消註冊：

unregisterReceiver(connectionReceiver);

 

【Android】詳解Android 網路操作